# 结论: 后续都用方法3

# 方法1 旧的
class Teacher1:
    pass

# 方法2 旧的
class Teacher2():
    pass

# 方法3 新的
class Teacher3(object):
    pass


if __name__ == '__main__':
    t1 = Teacher1()
    t2 = Teacher2()
    t3 = Teacher3()

    print(t1, t2, t3)
